package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealDishService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper,Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealDishService setmealService;
    /**
     * 根据id删除分类，删除前需要判断是否有关联
     * @param id
     */
    @Override
    public void remove(Long id){
        //查询当前分类是否有关联了菜品，如果关联，抛出一个业务异常
        //构造查询条件
        LambdaQueryWrapper<Dish> dishLamdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLamdaQueryWrapper.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(dishLamdaQueryWrapper);
        if(count1 > 0){
            //如果关联菜品，抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查询当前分类是否有关联了套餐，如果关联，抛出一个业务异常
        //构造查询条件
        LambdaQueryWrapper<Setmeal> setmealLamdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLamdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count();
        if(count2 > 0){
            //如果关联套餐，抛出一个业务异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //正常删除分类
        super.removeById(id);
    }
}
